Add: nix-script repl

This is a combination of 23 commits:

    * Add first draft for nix-shell repl
    * Remove functions which are in nix-utils.sh
    * Minify if-then-exit
    * Remove sudo run... why do I actually have this?
    * Include helpers
    * Add help text
    * Remove old arguments in parsing code
    * Dont print on stderr, do debugging output here
    * Remove explain checker, use dbg() as output function
    * Fix checker
    * Use bash to print
    * Use "exit" or "quit" to exit nix-repl
    * Remove doubled caller code
    * Move: script_for() function to helpers
    * Remove old variables
    * Fix bash call
    * move all_commands() function to nix-utils.sh
    * Formatted and extended all_commands() function
    * Lists executables only.
    * Shorten error message
    * Add helper to check whether a string contains a string
    * Add possibility to execute simple bash commands in repl
    * The more debug output, the better
    * More things, we should really squash this stuff

1 files changed, 26 insertions, 0 deletions

diff --git a/nix-utils.sh b/nix-utils.sh
index 9e2fd3c..a34a2ee 100644
--- a/nix-utils.sh
+++ b/nix-utils.sh
@@ -6,6 +6,13 @@ Yellow='\e[0;33m'
 Green='\e[0;32m'
 
 #
+# Check whether a string (2nd arg) contains a substring (1st arg)
+#
+stringcontains() {
+    [ -z "${2##*$1*}" ]
+}
+
+#
 # Print on stderr, in red
 #
 stderr() {
@@ -28,6 +35,25 @@ stdout() {
 }
 
 #
+# List all available commands as script path
+#
+all_commands() {
+    find $(dirname ${BASH_SOURCE[0]}) \
+        -type f \
+        -executable \
+        -name "nix-script-*.sh"
+}
+
+#
+# Get the name of the script file for the command passed as argument
+#
+# Does not check whether the file exists.
+#
+script_for() {
+    echo "$(dirname ${BASH_SOURCE[0]})/nix-script-${1}.sh"
+}
+
+#
 # Get the command name from a script path
 #
 scriptname_to_command() {